as CTX himself said in steam forums: Alright there are 3 things that were borken by recent csgo updates:

1. Crocodile is unkillable, to fix this, type !load to the chat, then mp_restartgame 1 to the console, and jump into [4] checkpoint

2. Alvin is unkillable in 5th chapter, to fix this, meet Alvin first, until you stuck in "QTE" animation type ♥♥♥♥youctx to the chat, type NOSUFFER to the chat, type this line to the console: sv_cheats 1;ent_fire @cs9 runscriptcode "Next()";sv_cheats 0

3. Boss is invisible at the end, to fix this, start the boss fight, then: type ♥♥♥♥youctx to the chat, type NOSUFFER to the chat, type this line to the console: sv_cheats 1;ent_fire enemy0 runscriptcode "Death()";sv_cheats 0